The ATSUFontFeatureType type describes the attributes of a particular font feature. For example, kLigaturesType represents the presence of ligatures in a font. You pass the ATSUFontFeatureType type to functions that set or clear font feature types in a style run. The ATSUFontFeatureType type is passed back by functions that obtain font feature types in a style run.
typedef Uint16 ATSUFontFeatureType;